Message-ID: <DBD9E54419194E01919FE57DE382E3C1@AGB>
From: "Graham" <g8fzk@g8fzk.fsnet.co.uk>
To: <rsgb_lf_group@blacksheep.org>
References: <BFF6723B062BFF40B4B7A6CF670160B4040FEB50@argos2.clb.tcfr.thales><002301cb1e8c$d28d4740$4001a8c0@lark><4C35C346.7080307@iup.uni-heidelberg.de><003001cb1eba$b04ba950$4001a8c0@lark> <AANLkTileY5Sk4URCfce7Xv3S8lkjd4t65QVMocyiYOcY@mail.gmail.com> <5227DDA0D83340B0908DCBB3B9A42BE3@JimPC>
In-Reply-To: <5227DDA0D83340B0908DCBB3B9A42BE3@JimPC>
Date: Fri, 9 Jul 2010 00:38:59 +0100
MIME-Version: 1.0
Importance: Normal
Subject: Re: LF: Re: TA DX on the dreamers band?
Content-Type: text/plain;
	format=flowed;
	charset="iso-8859-1";
	reply-type=response
Content-Transfer-Encoding: 7bit
Sender: owner-rsgb_lf_group@blacksheep.org
Precedence: bulk
Reply-To: rsgb_lf_group@blacksheep.org


Jim

ROS-MF-1  May  solve the  problem ?  from what I have  seen / measure it 
can
decode  up to   -3 db  below  the point wspr  stops responding ... sending 
the
same  data  that  wspr  sends , ie   G0NBD  IO83 20 , the  ros  tx period is 
very
close to that  of  wspr, but  approx  66% is  sync  start  and  stop 
frames.

Initial  test results by Gary  on 137 are quite  interesting in terms  of 
distance/power from a
compact array , but  tragically  claiming two  power  fet's in the  process 
.

If a  qso  by visible  qrss  is  possible then  a  data  qso  should  be 
quite  possible ?

G ,..


--------------------------------------------------
From: "James Moritz" <james.moritz@btopenworld.com>
Sent: Friday, July 09, 2010 12:16 AM
To: <rsgb_lf_group@blacksheep.org>
Subject: LF: Re: TA DX on the dreamers band?

>
> Dear Warren, LF Group,
>
> I think that is a slightly pessimistic view - the first acknowledged 2-way 
> transatlantic QSOs on 137kHz were, if I remember correctly, between G3LDO, 
> VE1ZJ, and VE1ZZ in a 3-cornered QSO, and between G3AQC and VA3LK in a QSO 
> spread over a number of nights, with each station transmitting on 
> alternate nights. There have been a couple of 2-way QSOs between VO1NA and 
> M0BMU using QRSS30.
>
> However, it is cetainly difficult to have QSOs like this - often several 
> attempts are needed, even when both stations are at the "legal limit" ERP. 
> Having a beacon signal that is regularly received is one thing, but when 
> you go for a QSO it is quite another, since at least a few hours worth of 
> break-free copy in both directions are needed to complete even a minimal 
> QSO at these very low speeds. As the distances increase, the probability 
> of this happening gets lower and lower, which puts the US stations at a 
> disadvantage compared to the VE stations. Reducing keying speeds further 
> is of limited benefit, because still longer periods of unbroken 
> propagation are needed.
>
> Achieving 1W ERP on 136k at M0BMU has always involved precarious methods 
> of temporarily extending the antenna height, including rigging the antenna 
> in the dark, and nervously checking it while hoping it doesn't fall down! 
> This is just due to typical space limitations. Combined with the fact that 
> propagation is usually most viable during the few hours before dawn in 
> Europe, this quickly becomes an exhausting process if more than a few 
> attempts are needed. So there is a pressing need to develop better ways of 
> having a QSO under these conditions. But for me, that is what keeps it 
> interesting...
>
> Cheers, Jim Moritz
> 73 de M0BMU
>
>